| 摘要 |
A ducted propulsion unit for an airship is described, together with a method of using the propulsion unit and an airship including such a propulsion unit. The propulsion unit has a propeller (28) mounted in a duct (22) with at least one port (32a,32b,36a,36b) in the wall of the duct downstream of the propeller allowing air flow transverse to the axis of the duct. The duct has a closure (33a,33b,37a,37b) to occlude outflow from the rear of the duct, and an additional closure to control flow through each port. Selective operation of one of the ports provides thrust radially to the axis of the duct for control of direction, altitude or attitude of the airship.
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